Pro Plan Urinary Tract Health Formula is formulated to be fed exclusively and should not be mixed with any other type of cat food. That's because Pro Plan Urinary Tract Health Formula is carefully balanced to reduce urinary pH and provide low dietary magnesium. By mixing in other products or switching to other brands, Pro Plan Urinary Tract Health Formula may no longer be effective in reducing urinary pH, which is essential in maintaining urinary tract health. For questions related to the health of your cat, see your veterinarian. Provide adequate fresh water in a clean container daily. For your petâ€™s health, see your veterinarian regularly.